• Country
• United States of America (USA)

• Manufacturer / Brand
• Silver - Marshall; Chicago, IL

• Year
• 1928 ?

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 213652

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 110 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Filament Transformer SM-247 - Silver - Marshall; Chicago, IL

• Shape
• Chassis only or for «building in»

• Notes
• Silver Marshall Filament Transformer SM-247;
  supplies "A" power (1.5 volts; 2.25 volts; 5 volts A.C.);
  Transformator; liefert Heizspannung (1,5 Volt; 2,25 Volt; 5 Volt Wechselspannung)

• Price in first year of sale
• 5.00 $

• Mentioned in
• Radio News (March 1928; page 1089)

• Author
• Model page created by Karlheinz Gützlaff. See "Data change" for further contributors.

• Other Models

• Here you find 225 models, 116 with images and 122 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Silver - Marshall; Chicago, IL